Door stop



FIG. 1 is a front view of a door stop embodying my new design;

FIG. 2 is an end view thereof taken from the right side of FIG. 1;

FIG. 3 is an end view thereof taken from the left side of FIG. 1;

FIG. 4 is a back view thereof;

FIG. 5 is a top view thereof; and

FIG. 6 is a bottom view thereof.

The ornamental design for a door stop, substantially as shown.